End-face grinder



F. H. MOONEY.

END FACE GRINDER.

APPLICATION FILED SEPT-18, 1920.

1 ,39 3,956, Patented Oct. 18, 1921.

2 SHEETS-SHEET 1.

F. H..MO0NEY.

um FACE GRINDER.

APPLICATION FILED SEPT- 18: I920- 1,393,956. Pa' oented Oct. 18, 1921.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FRANK H. MOONEY, OF HINSDALE, ILLINOIS, ASSIGN'OR TO CLARENCE E.BARRETT,

I I OF CHICAGO, ILLINOIS.

END-FACE GRINDER.

Specification of Letters Patent.

Patented Oct. 18, 1921.

Application filed September 18, 1920. Serial No. 411,091.

T 0 all whom it may concern:

Be it known that I, FRANK H. MooNnY, citizen of the United States,residing at Hinsdale, in the county of Du Page and [State of Illinois,have invented certain new and in its general objects aims to provide aneasily manipulated and widely adaptable machine for surfacing the endsof tubes, rods or barrels while maintaining a given spacing from thesurfaced end and some other portion of the object which is being ground.Furthermore, my invention aims to provide a machine of this class soarranged as to hold one after another of the objects which are to beground in proper position for the grinding, to feed the sameautomatically and with a predetermined pressure past the grindingsurface, and then to carry these objects into positions where they canbe removed either by hand or by gravity.

In one of its more particular aspects, my invention relates to thegrinding of tubes or rods 'to predetermined lengths and for this purposeaims to provide simple and easily fed means for carrying the tubes orrods through the field of the grinding and for threafter releasing themso that they will drop out of the clamps by gravity. In this aspect, myinvention also aims to provide simple and single means for effecting theclamping of the objects while these are being carried into position andpast the grinding surface, to provide a simple arrangement of clampingmeans, and to' provide simple means for adjusting the length to whichthe objects are to be ground.

In another aspect, my invention aims to provide simple means adaptedeither for grinding tubes to predetermined lengths or for grinding theclosed ends of barrels or the like to a predetermined thickness, and inthis embodiment also aims to provide simple means for adjusting theresulting lengths or thicknesses and for adapting the machine to tubesor barrels of varying diameters. Furthermore, my invention aims toprovide a grinding machine which will readily permit a single grindingdisk to be effectively used in connection with tubes, barrels or rodsfed to the machine by a plurality of operators, and in which the samegrinding disk can be used simultaneously for grinding objects todifferent lengths. Still further and more detailed objects will appearfrom the following specification and from the accompanying drawings, inwhich Figure 1 is an elevation of a machine embodying my invention.

Fig. 2 is a plan view of the same.

Fig. 3 is a reduced plan View of the cam plate associated with the tubefeeding mechanism at the left hand of F ig. 1.

Fig. 4 is a reduced plan view of the spin dle-raising cam used inconnection with the barrel or tube feeding drum at the right hand ofFig. 1.

Fig. 5 is an'enlarged and fragmentary plan view of the tube-feeding drumof big. 2, showing the clamping arrangement.

Fig. 6 is a vertical section. through the same parts, taken radially ofthe drum along the correspondingly numbered'line in Fig. 5.

Fig. 7 is an enlar ed and fragmentary longitudinal section through thetop of one of the spindles at the right hand of F igs. 1 and 2, andthrough a closed-end barrel supported by the same, showing thearrangement used in grinding the closed end of a barrel to apredeterminedthickness.

In the embodiment of the drawings, the machine of my invention includesa base 1 supporting three vertical risers 2,4 and 5, each of whichrisers has its upper portion reduced in diameter to afford a stationaryshaft for one of the main rotating members of the machine. The middleriser 2 has a shoulderadjacent to its juncture with the shaft 3 carriedby the same, which shoulder forms a thrust bearing for the hollow hub 6of a pulley 7 driven by a belt 8 and which hub is also fastupon a metaldisk 9 having a sheet of an abrasive material 10 glued to its lowerface.

The riser 4 likewise has a shoulder at its juncture with the shaft 11carried by the same, which shoulder supports the hub 12 of a drum 13provided on its periphery with a series of vertical notches, the risers2 and 4 being so spaced that the drum 13 underhangs a portion of thedisk 9. Each of these notches preferably has its forward face 14 (whenconsidered as to the direction in which I the drum normally revolves) atan acute angle to the periphery of the drum and its rear face 15substantially radial of the drum, so that this rear face will exert adirect thrust on an object inserted in the slot, such as the tube 11 ofFig. 5.

To hold theobjects in the slots, I provide suitable clamping means, suchas hinges, each consisting of a base plate 8 fastened to the peripheryof the drum and a clamping plate 19 swiveled to the base plate andadapted to swing toward or away from the drum. I also provide suitablemeans for automatically closing each clamp as it approaches the field ofthe grinding, for holding the clamp tightly closed while it carries thestock purpose, I desirably employ the same belt through the field of thegrinding operation, and for automatically releasing the clampingpressure after this part of the drum has passed out of the grindingfield. For this 20 which slowly rotates the drum 13 during the operationon the machine, by simply passring this belt peripherally of the drumoutside of the clamping belts 19, the belt being kept from slippingdownward off the clamping plates by its engagement with pins 21 carriedby the drum and each extending through a slightly larger perforation inthe adjacent clamping plate 19 as shown in Fig. 5, and I desirably usethese same pins 21 also for limiting the outward swinging of the saidclamping plates. To take the thrust of the grinding and to insure agrinding of each object to the desired length, I mount a cam plate 22 onthe riser 1 below the drum 13. This plate desirably consists of a diskhaving the main part of its upper surface spaced from the abrasive disk10 by a distance greater than the length to which the objects 11 are tobe ground. This disk has on the edge directed toward the middle riser 2an arcuate cam rim 22 which gradually slopes upward from its beginningat the bottom of Fig. 3 and which extends horizontally under a portionof the disk 9, and the disk desirably has a peripheral portion cutawayat the side opposite that on which the cam 23 is mounted, as also shownin Fig. 3.

In using the machine as above described for grinding tubes, each ofthese tubes is slipped into one of the slots back of a clamping plate 19when the latter is approximately in the position of the tube 11 of Fig.2, or

just before the adjacent clamping plate is engaged by the belt 20. Whenthus inserted,

the lower end-of the tube rests loosely on the horizontal flange of thedisk 22 and the top of the tube is below the plane of the abrasive disk10. As the drum 18 revolves, thebelt 20 clamps the plate 19-against thetube with a pressure just suflicient to hold the tube vertical, whilestill permitting it to be slid upward by the cam'23, after which thetube rides up on the top of this earn as shown at .to a predeterminedthickness.

and permitting the centrifugal force due to the rotation of the drum toswing the clamping plate outward or away from the adjacent groove, sothat the tube candrop by gravity past the recessed edge of the disk 22into a suitable hopper which is not shown on the drawings.

I11 practice, the tension of the belt is easily adjusted to secure thedesired tightness of the clamping andit will be noted that this clampingincreases as the tubes are raised and is maintainedat its maximum duringthe grinding, thereby insuring a square facing of the end of the tube.The disk 22 and the cam 23 on the latter can readily be adjusted as totheir height by loosening a set screw 21 which clamps this diskadjustably to the A riser 4, so that I can readily vary the length towhich the tubes, rods or the like are to be ground.

While the arrangement as'above described is highly satisfactory for manypurposes, it is limited in scope to such: diameters or rods, tubes orbarrels as can readily be gripped in the slots of thedrum, and togrinding objects to a predetermined total length. 7 It does not lenditself readily for use with objects of a smaller diameter than that forwhich the peripheral clots in the drum 13"are designed, nor-forgrindingthe closed ends of barrels For these latter purposes, Ipreferably provide a clifferent arrangement for holding the stock whichis to be ground, and desirably provide stock holders which will be movedbodily with the stock itself when the latter is being raised intothegrinding position.

To adapt my machine for suchcases also, I desirably provide a second.drum 25 pivotedon a shaft 26 which forms an extension for the riser 5and which drum has a hub bearing against a shoulder at the juncture ofthe stationary shaft 26'with the riser 5, as shown at the right hand ofFig. 1. drum 25 desirably has a pair. of peripheral beads 27 spacedvertically from each other to afford guides for a belt 28 bymeans ofwhich this drum is slowly rotated, the belts 8, 20 and 28 beingalldriven from a single source of power not shown'in the drawings. Therisers 2"and 5 .are so spaced that the drum 25'underhangs a considerableportion of the grinding disk 9, and the drum 25 has near its periphery aplurality ofbores extending longitudinally of the drum and desirablyparallel to its axis, Each of these bores slidably houses the shank of aspindle 28 which rests by gravity at its lower end against a disk 29secured'to' the riser 5 by a set screw 80, Thisdisk has fast upon it a The j tally under this disk, and afte ward returned by gravity to itsoriginal position as shown at the extreme right hand of Fig. 1.Consequently, any stock carriedby the spindles will be raised into thegrinding position and held against the abrasive disk during a part ofits revolutlon around the axis of the drum. 7

Where this portion of my machine is to be used in grinding hollowobjects to predetermined lengths, I provide each of the spindles with ashoulder 31 upon which the lower end of the stock will rest and throughwhich the thrust of the grinding is then transmitted to the cam 81. Byusing spindles having their upper or reduced shanks of varyingdiameters, I can readily adapt this portion of my machine for grindingtubular objects or" various bores, including sizes which could not behandled in the other part of my machine when this is adapted forgripping hollow objects of much larger diameter. For grinding the endsof barrels or the like to predetermined thicknesses, I select spindleshaving their reduced upper stem portions shorter than the bore of suchbarrels, so that the lower end of the barrel will not engage theshoulder 31, but the thrust oi"- the grind ing will be transmittedthrough the tip of the spindle. In this manner, as shown in Fig. 9, Ican readily grind the closed end or" a barrel 32 to a predeterminedthickness. This thickness can be varied by loosening the set screw 30and raising or lowering the cam-carrying disk 29, and the sameadjustment of the disk can likewise be used for varying the efiectivedistance between the shoulders 31 on the spindles and the grinding disk,so as to adapt this part of my machine for grinding tubular ob ects tovaryin total lengths.

ith the twin drum arrangement of grinding machine as above described, itwill be obvious that the same machinecan be used for grinding objectsvarying widely in shape and size, and that both parts of the machine canbe employed simultaneously by two different operators, or with slowlyrevolving drums even by one and the same operator using both hands infeeding the stock to the machine and using one hand also in removing thefinished stock from the right hand portion of the machine. My duplexmachine therefore saves considerableospace, power, first cost, and costof attendance over two separate machines for the same class of work,while also affording adjustments which adapt it for use in the endgrinding of objects varying greatly in size and shape.

However, while I have illustrated and described the clamping drum partof machine as used in connection with tubes, and have snown the clampingplates as swiveled to hinge plates fastened to the periphery of one ofthe drums, I do not wish to be limited to the particular form of stockillustrated, nor to the above mentioned or other details of theconstruction and arrangement here disclosed. Obviously, variousadditions, omissions or other changes might be made without departingfrom the spirit of my in-' vention or from the scope of the appendedclaims.

I claim as my invention:

1. In a grinder, a grinding disk having a downwardly directed abrasiveface, a rotating drum'having a vertical axis and partially underhangingthe said disk, the drum having on its periphery a plurality of groovesextending longitudinally of the drum and each adapted to receive one ofthe objects which are to be ground, separate clamping means carried bythe drum and respectively arranged for retaining the objects in thegrooves, single means for actuating each of the clamping means whileapproaching and passing under the said disk, and means for forcing theobjects upwardly against the disk while under the latter.

2. In a grinder, a grinding disk having a downwardly directed abrasiveface, a rotating drum having a vertical axis and partially underhangingthe said disk, the drum having on its periphery a plurality of groovesextending longitudinally of the drum and each adapted to receive one ofthe objects which are to be ground, separate clamping means carried bythe drum and respectively arranged for clamping the objects against thedrum to retain the objects in the grooves, means for actuating theclamping means while approaching and passing under the said disk, andstationary cam means for raising the objects into contact with the diskwhile passing under the latter.

3. A grinder as per claim 1, in which the clamping means'include movablestock clamping elements associated with the respective grooves, and asingle flexible member arranged for actuating all of the clampingelements.

4. A grinder as per claim 1, in which the clamping means include movablestock clamping elements associated with the respective grooves, and abelt arranged for rotating the drum and for successively actuating theclamping elements.

5. A grinder as per claim 1, in which the clamping means include movablestock clamping elements associated with the respective grooves, and abelt arranged for rotating the drum and for successively actuating theclamping elements, a belt rotating the .drum and successively actuatingthe clamping elements, and common means "for limiting the outwardmovement of the clamping elements and for retaining the belt inoperative position.

6. A work holder for carrying objects to a grinding disk, comprising arotating drum having on its periphery a plurality of longitudinalgrooves, clamping elements movably mounted on the drum and respectivelyoverlapping the grooves, and means for successively moving each clampingelement toward the drum to clamp an object in the adjacent groove duringa part of the rotation of the drum. 7 V

7. A work holder for carrying objects to a grinding disk, comprising arotating drum having on its periphery a plurality of longitudinalgrooves, clamping plates pivoted to the drum respectively adjacent tothe grooves and each adapted to be swung away from the adjacent grooveby centrifugal action, and means for swinging each plate ingitudinalgrooves, clamping plates pivoted to the drum and respectivelyoverlapping the grooves, and a tensionecl flexible member extendingaround a portion only of the periphery of the drum and engaging a partof the said plates to swing the latter toward theadjacent grooves.

9. A work holder'a's per claim 8, in combination with common means forlimiting the swinging of the plates away from thegroove and forretaining the flexible member in operative position. 7

10. A" grinde as per claim 2, in which the cam means are adjustablyspaced from the drum, whereby to vary the effective height to which theobjects are raised.

Signed at Chicago, Illinois, Sept. 9, 1920.,

FRANK H. MOONEY.

